The Monarch has recorded a intimate address regarding his battle with cancer, set to air as part of this year's Stand Up To Cancer initiative, run by medical research organisations and a television broadcaster.
Buckingham Palace stated the King would discuss his "recovery journey" as a cancer patient, in a recorded address on Friday evening at 20:00 GMT.
The address, filmed within a royal residence two weeks ago, will stress the critical nature of cancer screening checks to ensure more people catch the condition at an treatable phase.
This constitutes a infrequent public commentary on the wellbeing of the Monarch, who has been undergoing regular treatment since his condition was announced in early last year. Analysts suggest unlikely the King will disclose his specific form of cancer.
Fundraising Core Mission
The annual charity event each year generates donations for clinical trials and treatment and urges people to get health assessments to boost the odds of an early diagnosis.
The King's public discussion about his health challenge, and managing the disease, has been aimed to increase understanding and to get more people to get tested - and this will be escalated with this exceptional personal contribution.
So far the King's main approach to his cancer has been to continue his schedule, preserving a busy schedule despite his regular rounds of therapy, and he appears not to have wanted to be characterised by his diagnosis.
The past twelve months has seen the King, 77, taking several international tours, such as visits to Italy and Canada, and receiving the biggest number of official guests to the UK for a generation, which included the German president last week.
Friday's Broadcast Event
This Friday's charity broadcast on television, presented by celebrities like a team of famous hosts, will appeal to people not to be afraid of getting health screenings.
Each presenter have been affected by cancer - Davina McCall revealed last month she had had an operation for a tumour, while Clare Balding was diagnosed with thyroid cancer in the past. Presenter Adam Hills has previously spoken about his late father, who had a diagnosis and then later another illness.
The show will target the estimated millions of people in the UK who charities says are not current with NHS screening schemes, with an website to let people see if they are able for examinations for key health indicators.
In an effort to demystify cancer checks and illustrate the value of timely identification there will be a direct feed from cancer clinics at Addenbrooke's and Royal Papworth hospitals in Cambridge.
"I want to remove the anxiety out of health checks and prove everyone that they are not on their own in this," said one of the hosts.
Available National Services
Currently in the UK, there are several key NHS cancer screening programmes - for specific cancers - accessible for eligible individuals.
A new preventative initiative is also being phased in for individuals at increased risk of being diagnosed with the disease, primarily aimed at people in a specific age bracket, who currently smoke or have smoked in the past.
Men may discuss specific tests, but there is not a universal scheme currently available.
Funding Research
The charity campaign, which has collected £113m since 2012, is supporting dozens of research studies encompassing 13,000 patients.
His Majesty, in a message for attendees at a reception for related organisations in April, had discussed recognising the "daunting and at times scary experience" for cancer sufferers and their loved ones.
But he stated his personal journey of managing cancer had shown him that "the most difficult times of sickness can be alleviated by the support of carers," as he thanked those who looked after individuals with the illness.
Official sources has not made public what kind of cancer the King has, or what treatment he has received. The King's cancer was detected following he had undergone a medical treatment.
